“It’s a super massive black hole, containing the mass of 4 million suns, crushed down into a single point by its own gravity. The closer you get to the black hole, the stronger the gravity. Get really close and not even light can escape. So, it’s wrapped in a sphere of darkness 15 million miles in diameter. A black hole like this one has a dramatic effect on time, slowing it down far more than anything else in the galaxy. That makes it a natural time machine.
I’d like to imagine how a spaceship might someday be able to take advantage of this spectacular phenomena.” – Into The Universe With Stephen Hawking
This video belongs to Discovery Communications and is being used for educational purposes only.